fix: some typos/sentence in readme.md (#52)

* spelling mistake and incorrect preposition use

* This sentence maybe considered wordy.

README.md

@@ -27,12 +27,12 @@ This repository contains the smart contracts of the Sismo Protocol.
 
 There are three core contracts:
 
- - `core/AttestationsRegistry.sol`: The registry stores all attestations. It is owned by the governance that authorize/unauthorize issuers to record in it
+ - `core/AttestationsRegistry.sol`: The registry stores all attestations. It is owned by the governance that authorizes/unauthorize issuers to record in it
  - `core/Attester.sol` The standard abstract contract must be inherited by attesters. Attesters are issuers of attestations. They verify user requests and build attestations that will be recorded in the registry
  - `core/Badges.sol` Reads the registry. Stateless Non Transferable Token view of attestations (ERC1155)
 
 It also contains implementations of attester in `attesters/`:
-- `HydraS1SimpleAttester.sol`: ZK Attester using the [Hydra S1 Proving Scheme](https://hydra-s1.docs.sismo.io) and the notion of nullifiers. Users must provide a ZK Proof along their request to generate attestations
+- `HydraS1SimpleAttester.sol`: ZK Attester using the [Hydra S1 Proving Scheme](https://hydra-s1.docs.sismo.io) and the notion of nullifiers. Users must provide a ZK Proof along with their request to generate attestations
 - `HydraS1AccountboundAttester.sol`: Accountbound version of the Simple Hydra S1 Simple Attester. (Users can update at will where the attestation is stored)
 
 <br/><br/>
@@ -92,7 +92,7 @@ To develop a new attester, you must inherit the `core/Attester.sol` abstract con
 -  `_verifyRequest(request, proofData)`: You must implement the user request verification against the proof provided by the user
 -  `buildAttestations(request, proofData)`: You must build the attestations that will be recorded from a verified user request
 
-There are other optional hook functions that can be implemented:
+Other optional hook functions that can be implemented:
 
 - `_beforeRecordAttestations(request, proofData)`
 - `_afterRecordAttestations(request, proofData)`